Because the site was apparently hacked April 13, 2011, over 2000 prior threads were lost.
A recovery effort pulled a number of them out of google cache records and 'the internet wayback machine' archive site.
They look a little rough. It is possible that some graphs or pages might be missing but a good deal of effort was made to find and piece together what could be recovered.
At this point, you can find the date and author of the thread at the beginning of most of the recovered material.